Electric-arc lamp



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3-. G. WOOLLEY.

- ELECTRIC ARC LAMP. No. 310,330. Patented Jan, 13, 1335.

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S. G. WOOLLEY. ELECTRIC ARC LAMP.

1 ii W H 3 U 1 w w R N E a H N pm LDIJU wm N\ .UNITED STATES PATENT OFFICE.

LEONIDAS G. IVOOLLEY, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO THE OHIO POW'ER AND LIGHT COMPANY, OF DAYTON, OI-IIO.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 310,630, dated January 13, 1885.

A pplicatitn filed August 30, 1883. (No modvl.)

To all whom it may concern: rod, on which I mount a weight, B, which Be it known that I, LEONIDAS GAVOQLLEY, about or quite balances said arm and carbon. of the city of Indianapolis, county of Marion, As the carbon is consumed I maintain the and State of Indiana, have invented certain equipoise by means of the segment F and 5 new and useful Improvements in Electric weight F, as will be hereinafter described. Lamps, of which the following is a specifica- The carbonsC O are curved, so as to occupy 5 3 tion. an arc of a circle struck from the center of My present invention relates to certain dethe pivots b, and thus that their points shall tails of construction and novel arrangement always be in the same relation without refer- IO of the operating mechanism of an electric ence to the length of said carbons 'or the dis lamp, allashereinafterdescribed, and pointed tance that said points are apart, as plainly out in the claims. shown in Fig. 1. I havealso provided a new Referring to the accompanying drawings, method of fastening the carbons to the arm. which are made a part hereof, and on which Instead of the usual clamp into which the similar letters of reference indicate similar round ends of the carbons are inserted I have parts, Figure I is a side elevation of an eleeflattened the end which is to be attached to tric lamp embodying my invention; Fig. 2, a the arm, formed a hole therein, and am thus top or plan View of the same; Fig. 3, a deenabled to attach it to said arm by means tail elevation showing a cam-segment which of a simple thumb-screw, b, as shown in Figs. 20 forms one of the features of my invention and l and 2. The hole is also shown in one porthe weight attached thereto; and Fig. 4, aview .tion of Fig. 4. It is important that the ends showing a portion of several carbons, the ends should be flattened for another reason-via, of which are of different forms, but all adapted that the carbon 0 must always be in perfect to be used with my improved lamp. position, or it will, as it advances, get out of 25 In said drawings, the portions marked A the properrelation to the carbon C. By havrepresent the frame-work of the lamp; B, an ing the ends of the carbon of another than a arm or bar pivoted thereon and carrying the round form, and the end of the arm B simicarbon; C O, the carbons D, the solenoid, and larly formed ,when the two are placed together E F segments or wheels on the shaft to the they are always brought into the same posi- 30 arm B. tion, and by having the supply of carbons all The frame-work A is preferably a solid castmade alike no further attention need be paid ing of suitable form mounted on suitable legs to the matter of adjustment. or a base, but may be any frame-work of the The solenoid 1) operates in the usual and required strength and rigidity. well-known manner to regulate the approach 5 The arm or bar 13 is mounted on the pivotl of the carbon 0 toward the carbon 0 as said shaft 13 and carries the carbon C, which it is carbons are consumed; but its arrangement 8 adapted to carry forward as the latter is conin relation to the other parts of the lamp and sumed, in the manner which will be presently the means of attaching it to the arm B, I redcseribed. Theshaft B to saidarm is mounted gard as novel. Said solenoid is of consider- 0. preferably 011 pivots b passing through lugs ably grcaterlength than those ordinarily used,

a on the frame A, and which are so constructed and is placed in a horizontal position, as go as to operate with the least possible amount shown, instead of vertical, as has been usual. of friction, so that the movement of the arm The core D passes loosely through it, and is B shall be steady and uniform as the carbon supported by the anti-friction rollers. a in the 4 5 is consumed. 5 frame A. It is thus permitted to move back In order to relieve the solenoid from the and forthwith theleast possiblefriction. Said strain and labor of holding up the weight of core is connected to the shaft 1 through the the arm 13 and carbon 0, I extend from said medium of the small cord or chain c and the arm on the opposite side of the pivot-shaft a segment IE, and operates thereon reverselv to the weight of the arm B and carbon C. The unusual length of the solenoid D is for the purpose of obtaining as near as possible a uniform pull on the shaft B by the core D of said solenoid throughout its entire movement.

The segment F is set eccentrically on the shaft B and has asmall weight, F, suspended therefrom by means of the chain or cordf. This small weight is for the purpose of moving the carbon forward as it is consumed and the action of the solenoid thus weakened by the consequent increasing of the length of the are. As the carbon is consumed it becomes lighter, and the eccentric formation of the segment is to equalize this varying weight, the action of the weight F being greater as the carbon grows shorter and the arm approaches a more nearly horizontal position. Thus the I weight B does not have to be moved, and the equipoise between the arm and carbon and said weight is maintained.

I regard myself as the first inventor of a differential device for this purpose, and there fore do not desire to be understood as limiting myself to the form shown, as other forms may be employed.

Having thus fully described my said inven tion, what I claim as new, and desire to secure by Letters Patent, is-

attached thereto, and a weight suspended to said segment, whereby as the carbon is consumed and said arm approaches a more nearly horizontal position the lost weight is compensated for, substantially as set forth.

2. In an arc lamp and in combination with the fixed carbon thereof, the curved carbon secured to the pivoted and balanced arm or lever, the compensating balance for the carbon and the attached core and operating solenoid, substantially as described.

8. In an arc lamp, the combination of a counterbalancedarm or lever carrying one of the carbons, an electro-magnet operating upon said arm in opposition to the weight of the carbon to restrain its movements toward the opposite carbon, and a compensating device acting in opposition to the counter-weight, and with a force increasing in proportion to the consumption of the carbon and its diminution in weight, substantially as described.

4;. In an electric lamp, a curved carbon provided with a flattened or angular portion for attachment to the holder to prevent the displacement of the carbon, substantially as described.

In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, this 25th day of August, A. D. 1883.

LEONIDAS G. \VOOLLEY.

Corrections in Letters Patent No. 310,630.

[SEAL] Oountersigned M. V. MONTGOMERY,

Commissioner of Patents.

It is hereby certified that Letters Patent No. 810,630, granted January 13, 1885, upon the application of Leonidas Gr. Woolley, of Indianapolis, Indiana, for an improvement in Electric Arc Lamps, was erroneously issued to The Ohio Power and Light Company, of Dayton, Ohio, as assignee; that said Letters Patent should have been issued to The American Electric Headlight Company, of same plaice and that the proper correction has been made in the files and records of the case in the Patent Office and should be read in the Letters Patent to make the same conform thereto.

Signed, countersigned, and sealed this 14th day of July, A. D. 1885.

H. L. M-ULDROWV, Acting Secretary of the Interior. 

